Journal of the Oceanographical Society of Japan
Online ISSN : 2186-3113
Print ISSN : 0029-8131
ISSN-L : 0029-8131
Study on the Manganese Nodule
Akihiko OKADAMakoto SHIMA
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1970 Volume 26 Issue 3 Pages 151-158

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Abstract

Chemical and X-ray analyses were performed on the fifteen manganese nodules collected from the Pacific Ocean floor. The results were discussed compared with the previous data on the manganese nodules. Minerals were found to be todorokite, δ-MnO2 and other silicates, montmorillonite, illite, phillipsite and α-Si02. Average composition shows that copper is concentrated on the deep sea nodules more than the shallow ones, and that the todorokite rich nodules contain more copper and nickel than the δ-Mn02 rich ones. The analyses of fresh water iron-manganese precipitates by bacterial activity suggest that biological process is one of the important factors on the genesis of the sedimentary iron-manganese deposits, in cluding the manganese nodule.

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